Time for just one thing (4)

I believe the answer is:

item

I'm a little stuck... Click here to teach me more about this clue!

'one thing' is the definition.
(an item is a thing)

'time for' is the wordplay.
'time' can be anagrammed to 'ITEM'.
But, I am not clear how the anagram is indicated.

'just' acts as a link.

Can you help me to learn more?

(Other definitions for item that I've seen before include "Indivual unit" , "Individual unit in a list" , "Detail (in a list)" , "A single piece of information" , "Object, detail" .)

I've seen this clue in The Globe and Mail.

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